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Sat, 21 May 2022 11:32:12 -0700 (PDT) Message-ID: <0c73ce5c-3625-6187-820e-1277e168b3bc@openvz.org> Date: Sat, 21 May 2022 21:32:11 +0300 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.8.1 Subject: Re: [PATCH v3] tracing: add 'accounted' entry into output of allocation tracepoints Content-Language: en-US To: Steven Rostedt Cc: YoPOhRctb8wwbmY5@carbon.kvack.org, Shakeel Butt , Roman Gushchin , Vlastimil Babka , Matthew Wilcox , Hyeonggon Yoo <42.hyeyoo@gmail.com>, Muchun Song , kernel@openvz.org, linux-kernel@vger.kernel.org, Ingo Molnar , Andrew Morton , linux-mm@kvack.org, Joonsoo Kim , David Rientjes , Pekka Enberg , Christoph Lameter , Michal Hocko References: <20220518160447.20a7b96f@gandalf.local.home> <20220519100348.101d027d@gandalf.local.home> <20220519123255.543b8db6@gandalf.local.home> From: Vasily Averin In-Reply-To: <20220519123255.543b8db6@gandalf.local.home> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Queue-Id: 780ED1C000A X-Stat-Signature: ro3cdqqb9ppzeishoxdz9fyq6e9y4owz Authentication-Results: imf18.hostedemail.com; dkim=pass header.d=openvz-org.20210112.gappssmtp.com header.s=20210112 header.b=dtMTibjG; spf=pass (imf18.hostedemail.com: domain of vvs@openvz.org designates 209.85.208.169 as permitted sender) smtp.mailfrom=vvs@openvz.org; dmarc=pass (policy=none) header.from=openvz.org X-Rspamd-Server: rspam03 X-HE-Tag: 1653157919-97853 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 5/19/22 19:32, Steven Rostedt wrote: > On Thu, 19 May 2022 19:29:36 +0300 > Vasily Averin wrote: > >> Frankly speaking I vote for performance with both hands. >> However I'm still would like to avoid new sparse warnings. >> Christoph Hellwig just recently taught me, "never add '__force' before >> thinking hard about them", but in this case I would need to use it three times. >> >> I found that bitwise typecasts can be avoided by using translation unions. >> >> What do you think about following trick? > > It's really up to you memory management folks. Although I may need to > update libtraceevent to handle the union case. That may be a bit tricky. In this case, I would like to keep sub-optimal v3 patch version. If necessary, we can improve the performance later, and right now I will send v4 with minor patch description changes and ask Andrew Morton to include it in the mm tree. Thank you, Vasily Averin